Question

multiple choice question
the movement of substances from an area of high concentration to an area of low concentration without the assistance of proteins is a membrane transport process called
o facilitated diffusion.
o endocytosis.
o active transport.
o simple diffusion.
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Explanation:

Simple diffusion is the movement of substances from an area of high concentration to an area of low - concentration without the help of proteins. Facilitated diffusion requires protein channels or carriers. Endocytosis is the process of taking substances into the cell by forming vesicles. Active transport moves substances against the concentration gradient and requires energy and often proteins.

Answer:

simple diffusion.